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pani
Joined: 09 Jan 2011
Posts: 16
Location: Curacao
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 Posted: Sun Jan 09, 2011 10:07 pm Post subject: Panasonic TC-20G11P dead |
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Hi,
I have a Panasonic 20" TV, Model TC-20G11P.
It was working perfect yesterday and this morning when I turned it on it was dead. Only the bypass light was on. I have checked the cord and the fuse but they are OK. Where can I start.
Thx in advance. 
Pani |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Sun Jan 09, 2011 11:51 pm Post subject: |
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Raw B-Plus across C824? (approx. 160 volts)
12 volts stand-by across C861?
18 volts across C859?
130 volts across C865?
Any relay "click?" |
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pani
Joined: 09 Jan 2011
Posts: 16
Location: Curacao
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| Posted: Tue Jan 11, 2011 1:39 pm Post subject: |
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Across C824 175 volts
Across C861 9.7 volts
Across C859 16 volts
Across C865 130 volts
Yes, there is a relay click when pushing the bypass button |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Tue Jan 11, 2011 3:46 pm Post subject: |
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130VDC on both sides of R552?
Q501 & Q551 are OK? Do you feel/hear High Voltage? |
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pani
Joined: 09 Jan 2011
Posts: 16
Location: Curacao
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| Posted: Wed Jan 12, 2011 10:59 am Post subject: |
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R552 130 VDC on both sides
Q501 measured out of circuit. No measurement on C and E in both sides and also no measurement from between B and E in both sides
Q 551Measures 56 ohms in both directions. B to E/ E to B |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Wed Jan 12, 2011 4:43 pm Post subject: |
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| Q001 base & collector voltage as you press "power". Steady or "there and then gone?" |
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pani
Joined: 09 Jan 2011
Posts: 16
Location: Curacao
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| Posted: Thu Jan 13, 2011 3:38 pm Post subject: |
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| Q001 Base and collector voltage 0.66Volts. Steady |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Thu Jan 13, 2011 4:08 pm Post subject: |
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IC001 Pins 22 & 61 = 5 volts? also pin 8 of IC002?
Pin 31 of IC001 goes from hi to lo (or vice-versa) each time power button hit? Also pin 5 goes up/down each press of power button? |
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pani
Joined: 09 Jan 2011
Posts: 16
Location: Curacao
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| Posted: Thu Jan 13, 2011 8:20 pm Post subject: |
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IC001 Pins 22 and 61 are both measuring 5 volts
IC002 pin 8 is 5 volts
Pin 31 of IC001 = 5 volts it does not change when hitting pwr.button
Pin 5 goes up and down each press |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Thu Jan 13, 2011 9:01 pm Post subject: |
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| Do you have a oscilloscope? If so see if microprocessor oscillator is working (pins 63 & 64) and see if CLK & DATA (pins 60 & 59) between EEPROM and micro are active while pressing buttons. Reset pin (pin 54) should also be hi. |
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